ILPC2378 按键输入问题

只看该作者 · 2013-11-8 01:32

请教一下：我需要实现：按下Key时，p0.6输入为0，输出enableP2.4=0,但实验室，按键输入没反映。为什么？？谢谢！

#define enable  (1<<4)  //p2.4 is enable  motor.0X00000010
#define key (1<<6) //p0.6 is connect key

int main (void) {

int i;

PINSEL4 |=0x00000010;    //set GPIO P2.4,(p2.2is PWM function)
PINSEL0 |=0X00000000;    //SET GPIO P0.6

FIO2DIR |=0x00000010;    //pin p2.4 is an output
FIO0DIR =0; //PIN P0.6 IS INPUT
   if ((FIO0PIN & key)==0) FIO2CLR=enable;    //set p2.4=0,motor stop,(when press key,p0.6=0)
   else FIO2SET=enable;       //set p2.4=1(when release key,p0.6=1)

pwm_init(); //initialize pwm

PINSEL4 |= 0x10; //PWM outputs its signal at GPIO Port 2.2
pwm_setup(3, PWM_SINGLE);

pwm_write(3,50);

}